The basic Shopify data saved about the customers:
First Name
Last Name
marketing consent
Soon, a list of requests made by the user on the website.

In addition :
In case you collect more information about the user through custom forms and/or addition apps, you should be able to produce a list of all this data.
In case the user asks for a context on how you’re using this data, you should also be prepared to provide :
-- The purposes for which the customer’s data was processed.
-- The third-parties that received this data.
-- Any relevant retention periods.
-- Where the information was collected from (if not directly from the customer).
-- Whether or not the data was used as part of any automated decision-making.

Here is more information about this from Shopify.
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